If you can find it, there was a movie made of the book "Hatchet." Which was about a boy who gets stuck out in the Canadian wilderness. I believe the movie was called, "Cry in the Wild" or something along those lines. It's been a while since I've seen it, but I know the book is read by middle school students, so the movie is probably appropriate for a young boy.

When I was a kid in elementary school (around 10 or so) I used to like reading the Huck Finn/Tom Sawyer books. Not necessarily for wildness survival stuff, but more because they had a lot of outdoor adventures. Not sure if any good movies were made, but it might also be worth looking into.

That's all I can think of off the top of my head. Good Luck in your search!