Never seen one of mine in that position, so no, not exactly normal I would say.
How old is he? Can he hop and stand up normal, and when he sits upright are the legs appr. paralell under his body?
Is it only on this type of floor (slippery?) where he does that? Does he assume a normal posture when peeing and pooping?
One can't tell much just from that one picture, there it looks kinda like Splayed Legs, a congenital condition, it differs how severe it is and if it effects the normal life of the rabbit.
Personally, I would have a vet have a good look at his hips/spine, just to be sure - my last buck developed issues and sitting in a wiered position (different one) was one of the first signs.
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