Are there any ethernet motion sensors that are compatible with Hubitat? I can't find any, but I also can't believe that there are none
I've honestly never seen one before.. That said in order for it to work there would have to be an api for it or if using a different system then an api for that system. Then preferably that api would be local and not cloud based.
Outside of occupancy sensors that power something I've never seen an Ethernet based motion sensor. Mains based sure, but then that will use Zigbee/z-wave/Wi-Fi etc....
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Found one, but dang that's pricey and bulky (and everything that rlithgow1 said is still true about actually getting the events into Hubitat).
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Wow almost 200 buckaroos for something you could get for less than 20 in USB powered zigbee... No thanx... 
I mean think of the overall power consumption...
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Could probably DIY one pretty easily if you are interested in that. Any sort of Arduino or ESP with Ethernet, a motion sensor, and a simple webserver. Then write a custom driver that either polls that or receives a data push from it (either an http post from the device or websocket method, post would be easier). Basically similar to how an Ecowitt gateway works for weather stations.
Could mix in WiFi ones as well for added location flexibility. Plus those would be cheaper than most Ethernet ones and could still be powered with a cheap PoE adapter if you were planning on that method.
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I think we could just get a POE adapter and use it to power a zigbee motion sensor from the stepped down output at 5 volts. I have a Samsung Motion sensor that i run off micro-usb, but that motion sensor was made like 10 years ago, you may find similar.
https://www.amazon.com/ANVISION-Splitter-802-3af-Compliant-100Mbps/dp/B08HZHZBXC/ref=pd_ci_mcx_mh_mcx_views_4?pd_rd_w=8Y7Sv&content-id=amzn1.sym.1bcf206d-941a-4dd9-9560-bdaa3c824953&pf_rd_p=1bcf206d-941a-4dd9-9560-bdaa3c824953&pf_rd_r=A81V0GRA4WK6MSAQDVKB&pd_rd_wg=SQbpi&pd_rd_r=93ceb814-2235-46cf-8730-b27d44f0ed7b&pd_rd_i=B08HZHZBXC
EDIT-found a USB power sensor- Z-wave
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I'm also not aware of any, so the two options I can think of are settling for a regular Zigbee or Z-Wave sensor that happens to take USB power and could be used with POE and an adapter just to avoid batteries, or using a traditional hardwired alarm sensor along with some board that can interface with your hub over your LAN if so desired (e.g., Konnected, HubDuino, or other options).
If you go with that first option, besides the HomeSeer HS-MS100+ above, others I'm aware of are the Zooz ZSE18 (nearly identical hardware), the ZSE29 (bulky and meant for outdoor use), the Aeotec Multisensor 6 or 7, or the Neo Coolcam 700 motion/5-in-1 sensor (also found as Haozee and possibly other brands). That last one is my favorite -- not as expensive as some other options (except Zooz) and faster than probably any other Z-Wave sensor I've tried. On the downside, it's hard to find in the US but can be shipped from overseas (e.g., the Neo Coolcam store on AliExpress) if that is not a concern.
Discontinued options you might be able to find on the secondary market include the first-generation (Kickstarter-era) SmartThings motion sensor mentioned above and the Inovelli LZW60. Or, you could get one of those CR2- or CR123A-shaped "battery eliminator" things that take micro-USB power and use it with about any device.
...to name a few options that might work, depending on the actual need. 
I use Aeotec MultiSensor 7s connected to a POE adapter via USB that’s connected via Ethernet back to a POE network switch to provide power.
I use Amcrest PoE cameras and a Camect NVR - the Camect is capable of identifying people and distinguishing from other kinds of motion. @brianwilson's excellent integration exposes them to HE as motion sensors. So in essence it's an Ethernet motion sensor with a bonus camera!
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Thank you very much. Your replies have been very helpful in me closing the task - no Ethernet motion sensors and sticking with what I have
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I suspect that an Ethernet POE motion sensor might be suitable for commercial security applications where the high price tag might not be an issue. If a commercial building is wired with Ethernet cable in the walls and ceiling, then using POE devices avoids the maintenance headaches of battery powered devices. Many commercial buildings have false ceilings above which such cabling can be easily installed.
For home use, most of us do not have Ethernet cabling in every room and installing cables in ceilings and walls is seldom easy. Thus, inexpensive battery powered sensors that can be placed conveniently anywhere is the way to go for most of us. The drawback is that we have to monitor battery life and replace batteries periodically. Commercial and industrial applications normally avoid battery powered devices other than for emergency lighting and signs.
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