Sandy is a boss in Final Fantasy IV. She is one of the Magus Sisters, a recurring trio of characters who impede the player's progress.
Sandy appears with her sisters at the top of the Tower of Zot. When all three are alive, they use a very strong attack combo called Delta Force. Sandy will also cast Reflect on Cindy and Mindy to allow Mindy to cast spells onto the player's party, even if they have Reflect status.