Bake the white cake as directed on the box using a 9x13-inch pan.
While it's still warm, poke holes all over the cake using the end of a wooden spoon.
In a bowl, mix the cream of coconut and sweetened condensed milk until smooth. Pour this mix evenly over the cake, letting it seep into the holes.
Let the cake cool completely. Once cooled, spread the whipped topping over the cake.
Sprinkle shredded coconut generously over the top.
Cover and refrigerate the cake for at least 4 hours or overnight before serving. Trust me, it’s worth the wait.