sure, just be sure you watch him, at that age its real easy to loose them. best is to have a leash but if not make sure you have a solid 80 or so feet around where you place him so if he runs off he cant go under your house or into a street or some place you cant reach him. when sindragosa was younger she ran under my old house i rented and i had to go get a pinky to lure her back out as i couldnt fit in the small area she ran under.
I had a roommate a few years ago with a turtle, took it into the backyard one evening to walk around and we never saw it again. Yes, his turtle ran away.
He stopped watching it for a couple minutes and it ran away. A turtle. So imagine how far a beardie could go.
Just keep an eye on him and its fine.