Do you want to keep your sand or not?
If not it is easy. Get 1/2 of the water out, get the rock/coral out in the water, get the fish out. Get most of the water out. Dump the sand , move the tank then put everything back with some new water.
If you want to keep your sand bed, then it get tricky because you cannot disturb the sand.
You can get some of the sand, like the top inch or so, and use new sand (recommended). Just move the tank as above except then you put the new sand in, some of the old sand on top, add rock and then add water and corals and fish.
If you want to keep all the sand, then you need to build a patform with wheels, same hight as your stand. Removed as much water and rock as you can, you can bolt the platform to the stand, then move the tank over to the platform. You wheel the tank to where you want, move the stand over, then scoot the tank over to the stand and restart. I actually use this method to my brother 120 g tank. Make sure you use heavy duty wheels. You can get them from Home Depo. If you are cheap, and carful, you can return the wheel back undamage once you finish. You cannot disturb the sand or else you will need to let it recycle befor putting fish and corals in.
Minh