Bring water to a boil in a pot. Add the soaked sago pearls and cook for about 30 minutes, stirring occasionally, until translucent.

Once cooked, drain the sago pearls using a strainer and rinse under cold water to stop the cooking process.

In a mixing bowl, combine the coconut milk and sugar. Stir until the sugar is fully dissolved.

In serving bowls, layer the cooked sago pearls, diced mangoes, and pour the coconut mixture over the top.

Chill in the refrigerator for at least 30 minutes before serving.