If I understand your question, sure, the Phillips hue bridge will accept multiple integrations, it doesn’t care. It can connect to SmartThings and to HomeKit at same time. Quite a few of us have that configuration for Hue lights.
The problem, however, is that there is no official SmartThings integration for the Hue motion sensor. So it is not exposed to SmartThings through the official hue bridge integration.
There are some unofficial methods you can try, with some people reporting success and some not.
The following is the one which is most likely to be able to work at the same time that the motion sensor also works with HomeKit. Ask any follow on questions about it in that thread,