Preheat oven to 350F. Line baking sheets with parchment paper or silicone mats.
In large bowl, add both packages of shredded coconut. From bowl, remove 1 cup of shredded coconut and set aside.
Combine condensed milk, vanilla, and coconut (minus the 1 cup that was removed earlier) until the condensed milk coats all of the coconut.
In another bowl, combine egg whites and salt. Whisk until frothy. Add 1 tbsp granulated sugar. Continue whisking until stiff peaks.
Gently fold whipped egg whites into coconut mixture until just combined. Set aside.
Combine the reserved cup of shredded coconut with 1/3c sprinkles.
Gently fold the dry sprinkle/coconut mixture into the wet egg white/condensed milk/coconut mixture.
Using an ice cream scoop or 2 tablespoons, create 2 inch rounds and place on baking sheet. Cook for 16-18 minutes or until tops are slightly golden.
Allow macaroons to cool for 5 minutes on baking sheet and then transfer to wire rack to cool completely.
In the meantime, melt chocolate in microwave in 15-30s periods. Stir after each microwave period.
Once chocolate is melted and shiny, dip bottoms of macaroons into chocolate and then into a shallow bowl of sprinkles.
Return macaroons onto parchment, dipped side down. Place dipped macaroons into fridge to set completely (15-30 minutes).