Rinse the rice under cold water until the water runs mostly clear. In a medium saucepan, combine the rice, coconut milk, water, and salt. Bring to a boil over high heat, then reduce heat to low, cover, and cook for 12 minutes.

Quickly lift the lid, scatter the pineapple and sugar over the rice, stir once gently, cover, and cook 5 more minutes on low. Remove from heat and let the pan sit covered for 5 minutes.

Fluff the rice with a fork, sprinkle with toasted coconut flakes, and serve warm.