I would seriously have to agree with Tigg. I lost our first dragon, a rescue before I knew how nasty sand was.
You can use ceramic tile, or newspaper, or paper towels or non adhesive shelf liner for a substrate.
Also to clean any of these you can (with the tile) use a 50/50 water and lemon juice, the smell from the lemon won't harm your dragon and it makes the glass and tile shine so nice !
As for the others, just toss the shelf liner into the top of your dishwasher with no detergent. The others just toss (or if a gardener you can use as a mulch).
Hope this helps out !
Janie.