In the event that you made to play the sound, create another condition:
System: Pick by comparison->Object: Stone Expression: distance(Stone.X,Stone.Y,Player.X,Player.Y) < *distance in pixels where you don't want to hear the sound*
Remember to place that as the first condition.
Alternatively use Stone -> 'Is On-Screen', but then it won't work if it happens even a little outside the visible area.