Yes you chuffing can!? The PS3 has no native VPN software support true but what exactly is stopping you setting up your vpn with a proxy server and connecting the PS3 to that?
Outside World College / University Your Dorm
INTERNET <---------> Campus <-----------vpn----> Proxy Server <----------> PS3.
You could also set up a bridge on your computer and connect your PS3 to the vpn through the bridge. This depends on how tight/open the vpn is about it's clients.
You could also just share the internet connection your pc is getting through the vpn with the PS3.