I thought there would be! Will it be available at some point?
I haven't tested this personally, but I believe you can play DKII on Mac using Wine or Crossover.
Aside from having a Boot Camp Windows installation, your other options are VMware and Parallels.
Dungeon Keeper II wasn't developed for Mac OS X, nor has there ever been a port.
Dungeon Keeper I uses DOSBox so it works perfectly across all platforms.
Hope this helps!