There isn't any existing plugin/key map that comes even near to Vim's modal behavior. There is some basic support for a command mode (controlled by the command_mode option) built-in to Sublime Text 2, but I haven't been able to make it work, although it's been advertised in the relase notes (http://www.sublimetext.com/2
It was available in Sublime Text 1 and I built a simplified Vim emulator around it which worked ok-ish, but was hard to expand/mantain/test. I'm eagerly awaiting progress or improvements in this area in Sublime Text 2, and would like to see a decent and comprehensive Vim emulation at some point (not necessarily shipped with the editor). Sublime Text Multiselect looks like a solid foundation to build a very powerful visual mode on.
But that's all wishful thinking at the moment... Although let's not forget that Sublime Text 2 is in alpha.