Your only alternitive when moving the tank is to scoop out the sand bed as a 180 will be heavy enough before you factor in the couple hundred lbs of sand.
If when removing the sand you find pockets of dark and smelly sandbed then discard that sand as it has turned anerobic and not a part of a healthy sand bed. While taking the sand bed apart there will be some smell it wont be knock you on the floor kind of smell like a bad sand bed would be.
Reference an article we have in our articles area on moving a FW
tank. The princples are the same for the reef enviorment. The biggest thing is to have enough help and enough buckets/tubs to store the rock, sand, critters and as much water as you can.