If you can't find a better place to play, go to the music department of your school, make friends with a professor or clerk, and use one of the practice rooms when its not occupied to make a lot of noise. As a student at the school, you should feel entitled to use those soundproofed rooms as a resource.
Plan B, which is what I'd do, is buy a jamhub. (I've never tried one but I'm gassing for one.)