I will never ever use sand again..
When I had Jaffa I bought her from a breeder that kept all his beardies on sand, and was told to continue using it..
6months later I had to have her put down due to sand impaction, and it killed me.. I now have a new baby and have used slate for the bottom of the tank..
Sand also makes the tank harder to clean, starts to smell quite quickly, and can harbour mites and parasites..
Its your choice, I mean there are people who keep them on sand and never have a problem, but to be on the safe side, especially while your beardy is young, get the sand out, I would.
Hope this helps