I have been thinking about the same thing for a while, and have come to the conclusion that there is only 1 way to do it without moving everything. And it would take a long time.
What I was thinking was drain all of the water out into storage containers and have the new stand all set up and ready to go. By the way, you'll need at least 4 people to do this. Slide the entire old stand away from the wall (if it's up against one, that is). Next, put the new stand where the old one was. Next, have everyone lift the old stand onto a premade platform that will be at the same level as the new stand (I was thinking of a taller stand). Then, when they're even, slide the tank onto the new stand. If you try and lift the tank off of the old stand, you will probably crack it as the weight will no longer be distributed evenly. Also, keep in mind that your tank weighs a ton, the rock and substrate weigh a ton, and it's all WET!
Of course, if you have a reef ready tank, this won't work, and if you are planning on using your old equipment and can't get it out of your old stand until you move it and can't get it into your new stand with the tank on top, then forget it.
Let me know if it works (notice I don't want to be the one to try it!).
On second thought, just buy a new tank and stand. It'll be a lot easier. Then all you'll have to do is slide the damn thing over when it's empty. But then again, you're breaking down your tank.....