you should use new sand to start (black chunks). Once you have the system running you could decide what to do with the old sand.
When I move a tank I start by packing the rock into a container as thought a possible then top with tank water. Fish assorted into containers by size, temperament and stickers ( lion fish for example). Inverts are on their own. The old sand if reused will cloud the tank from hours to days. Also I find if you have a ice chest handy, it's one less container to find. I think it's called multitasking.
Reassembly starts with sand, rock and water. Let things settle then add animals. You will need several gallons of premixed water on hand, just in case.
P.S. Anglisht suxs