Preheat the oven to 350 F. In a large bowl, mix together cake mix, eggs, and vegetable oil until smooth. Place the pink sanding sugar in a shallow dish.
Roll the cookie dough into balls, and roll them into the pink sanding sugar. Place the cookies onto a large ungreased baking sheet at least 2-inches apart. Place conversation hearts on each cookie. Bake for 10-12 minutes.