Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
Sand will not make a good hill, it will erode very quickly.
If you do manage to make a hill, perhaps held with ground cover plants the move will shake the sand down.
Basically you would be re-scaping it when you move.
This is a safer way to approach it anyway: You do not want to use the tank as the container to hold all that weight during the move. It could break loose the silicone at the seams and create a leak.
Put everything in buckets and...
Move the tank empty.
A smaller tank might be stabilized by sliding it onto a sheet of plywood or a short shelf that fully supports the tank, and moved that way. I would still drain most of the water and remove the fish, though. Transport them separately.
You might make this work with a 10, but not with a hill in it. The hill would not survive.