If its a fish only tank, not much issue.
Siphon out the water in a container, take out all the bacteria housing/ media and filter wool. Place it in the bucket of siphoned water. Remove the fishes. Drain the tank, throw the sand, clean up the tank.
At your new place, just reverse the process. Add the old salt water, and top up the rest if required with new salt water.
For your fish load, and 2 year old tank, I doubt you will get any mini cycle happening even without the sand. Just keep the bacteria media soaked in water.