The following will help you play greenside sand shots better when practicing!
-Ball forward in stance.
-Slightly wider stance with knee flex.
-You can open club face to fit the shot and or do not allow the shaft to lean forward to properly use the bounce.
-Practice entry point using an alignment rod as demonstrated in video.
-Club should land 1 to 4 inches behind ball while swinging with enough energy to allow pocket of sand to carry the ball to your landing area.
Practice regularly to gain confidence and expect successful outcomes !
Enjoy the challenge!