Though I've never SM'd with a dance company (I've worked as a General Manager of a dance company briefly), I imagine the hiring process is similar to other SM areas. Throw your resume out there and try to get as many interviews as possible.
I've been reading news articles about a strange phenomenon in the dance world right now where, due to the terrible economy, some companies are touring less and yet at the same time other companies are touring more. It depends on what their ticket sales are like in their hometown. Sometimes going on the road, while an expensive undertaking, can bring in more profit than doing shows in a small and slow-selling hometown theatre. Other times, the company can't muster the staff/agent organization or the initial funds needed to launch a tour and so they're canceling road shows. Check, to the extent you are able, whether companies you'd like to tour with may be considering canceling their tours. You probably won't be able to get a clear answer, but digging for some info could be helpful and protect you a bit.
I hope our resident dance SM's here on SMNetwork will share their tips on getting hired here.
And there are some good posts on working in dance in general on our "Other" message board.