Part of the fun for me, at least, has been that there ISN'T a single-player mode. Just like in real life college basketball, you have to learn the ropes as you go along, and you're thrown in against the top coaches from the very start.
I suppose the difference is that you can't spend time as a graduate assistant first... but hey, the real-life graduate assistants don't get to beat up on the Sims when they finally get the job, either.