Moving from sorority to house in university life?

Like the above poster said, I'm pretty sure if you go to the admin building there's an option where you can request a roommate reassignment, which might help you out.

You could also just enable 'testincheatsenabled true' and then if you **bleep** & click where you want your sim to go you can teleport them to that location. Of course, be careful with this cheat enabled as it enables you to do many other things and could possibly damage your game if used wrong