I have something that was posted on the LIF recipes board, it's not coconut cake, well it has coconut in it, but it was yummy
Better Than Sex Cake
Yellow cake mix Large can of crushed pinapple 1 cup of sugar Two boxes of instant french vanilla pudding 8 oz. cool whip Shredded coconut
Bake the cake in a 9 x 13 pan according tot he directions. Let the cake cool.
In a pot combine the sugar and the pineapple. Heat the mixture until boiling. Let cool slightly and pour over the cooled cake.
Toast the shredded coconut by spreading it in a thin layer on a cookie sheet pan and baking for 10-15 minutes at 325 degrees, mixing it up frequently. Set aside.
Make the pudding according to the box, less 1/2 cup of milk. Pour that over the cake.
Put the cake in the fridge and let the pudding set.
Cover with cool whip and sprinkled toasted coconut on top.