Place a large bowl in freezer. Let ice cream stand at room temperature 45 minutes or until softened.
Preheat oven to 450°.
Cut pie dough round in half. Place half of dough on a baking sheet coated with cooking spray; reserve remaining dough for another use. Bake dough at 450° for 10 minutes or until lightly browned. Cool completely on a wire rack. Break crust into small pieces.
Place sweet potatoes, sugar, and spice in a bowl; mash with a fork until well blended. With a rubber spatula or stand mixer, combine sweet potato mixture, piecrust pieces, and softened ice cream in chilled bowl. Cover and freeze to desired consistency.