That depends on what the player did PRIOR to sliding with the ball. A player may dive for a loose ball and slide with it while in control and not commit a violation. A player may NOT be in control of the ball and then fall to the floor, sliding or not. This would be a traveling violation. Also, in the legal version above, with the player diving for the loose ball and sliding with it, this player may make a pass, shoot, start a dribble, or call a time out. If on his back, he may sit up, but any attempt to get to his feet, unless dribbling, would be a violation. If on stomach, he may not roll over to his back. This is found in NFHS Casebook 4.44.5 (B)