Stir 1 cup sugar and 1/3 cup water together in a small saucepan over medium heat until the sugar dissolves completely, about 5 minutes. Add the sugar mixture and the raspberries to a blender and blend until completely smooth. Strain the raspberries through a fine-mesh strainer into a small bowl.
Beat the heavy cream with the vanilla and the remaining 1/2 cup sugar in a medium bowl with an electric mixer on medium speed until stiff peaks form, 2 to 3 minutes.
Place a pound cake on its side and slice lengthwise into 1/4-inch thick strips to make the lasagna "noodles." Repeat with the second pound cake. Place 2 pieces of cake side-by-side in the bottom of an 8-inch square baking dish. Pour 1/4 cup of the raspberry sauce over the cake and smooth out with a silicone spatula. Sprinkle with 2 tablespoons coconut, dollop with 1/4 cup whipped cream and sprinkle with a third of the blueberries. Repeat this process 3 more times so you have a total of 4 layers. Chill for 6 hours and up to overnight. Slice and serve.
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