OK, the following community-created edge driver should work for you.
[Edge Driver] Hue Motion Sensor (No Hue Bridge)
Follow the invitation link in the first post in that thread. That will take you to a webpage where you can subscribe to the channel and then select the edge driver you want to download to your own hub.
It will then be automatically downloaded. This normally only takes a few minutes, but some users have reported it can take several hours.
Once it is downloaded, you can, then “scan nearby“ in the SmartThings app to connect the outdoor motion sensor to your hub, and it should use the new edge driver.
If you have any further questions about that edge driver, ask in that thread.
If you’d like to learn more about edge in general, here’s the community FAQ for that:
FAQ: I have no idea what Edge is. Is that a new developer tool? (2022)