I would also not recommend beach sand. If it is sand from a ocean water front, it can have the crushed coral in it, silica as well, and not to mention a pretty high concentration of salt. To clean it you will have to rinse it very well to wash off all the salt then disinfect it by baking in the oven. Even then, unless it is very fine, still risk it may cause problems in your dragon.
Children's play sand is easy to find here in North American, it may not be very common where you are from.
It may be better to find red-brown or tan colored non stick shelf liner, plastic table cloth or the like, instead. These pose no risk of impaction, are easy to clean and typically, are very cheap to buy. The plastic table cloth is basically the same stuff you see used on large banquet tables for wedding receptions, big events etc. and comes in big rolls which last a long time and are not very expensive overall. WIth my first dragon, that is what I used. I paid something like $20 for a roll that was a 100 feet long and about three feet wide. I used it for a good two years and still had about half the roll left. I had to sell my dragon at that time, else I would give a better ideal how long it lasted overall.
In my setup I put a layer or two of papertowel on the bottom of the cage and the plastic papertowel ontop. Tapped it down at the corners to keep it from shifting and prevent crickets from getting underneath it. Daily i would spot clean any poops the dragon had, washing the area with antibacterial soap after picking up the poop. Once a month I cleaned out the entire cage and put fresh paper towels and plastic table cloth. The paper towel gave a bit of 'cushion' to the plastic table cloth and also absorbed any fluids should it leak through holes in the plastic (holes from dragon claws, etc).
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PHLdyPayne