Use the bounce on your sand wedge correctly.

The sole of your sand wedge angles backward from the lead edge to create what is called bounce.  The bounce prevents the club from continuing to dig into the sand so that it glides under the ball and comes up and out on the other side.  To use the bounce, open the face of the club by turning the toe of the club to the right.  When you are playing a sand shot, do not open your stand wide to the right.  Aim toward the hole and swing straight back and through with the open face.  The club will slide through the sand and send the ball on the correct line to the hole.