Set aside 8 oz of the coconut milk. Mix cake mix according to package directions but use the remaining 6 oz of coconut milk as part of the required liquid plus 2 oz of water to make the one cup liquid required.
Bake cake in a 9x13 pan as directed on the box.
Remove cake from oven and while cake is hot poke holes in the cake with a large meat fork.
Combine the 8 oz of coconut milk (that was set aside) with the sweetened condensed milk and pour over the hot cake.
Let stand at room temperature for three hours and then top with cool whip and sprinkle the coconut on top of the cool whip. Store in refrigerator.
Coconut milk can be purchased with the Asian foods