Prepare and bake cake mix according to package directions, using a greased 13-in. x 9-in. baking pan. Cool completely on a wire rack.
Crumble cake into a large bowl. Add dulce de leche and mix well. Shape into 1-in. balls. Place on baking sheets; insert sticks. Freeze for at least 2 hours or refrigerate for at least 3 hours or until cake balls are firm.
In a microwave, melt candy coating. Dip each cake ball in coating; allow excess to drip off. Coat with cashews. Insert cake pops into a styrofoam block to stand. Let stand until set.
This recipe was tested with Nestle La Lechera dulce de leche; look for it in the international foods section. If using Eagle Brand dulce de leche (caramel flavored sauce), thicken according to package directions before using.