Soak sticky rice in water overnight or at least for 3 hours. This will help quicken the cooking process, as it causes the rice to get tender faster. Each brand of glutinous rice is different. Some may require a longer soaking time than the others. From my experience, 3 hours should be good enough for most brands.
Heat one cup of coconut milk in a saucepan or deep skillet over medium heat. Bring to a boil.
Drain the rice and add it to the coconut milk. Turn the heat down to low and stir constantly. Once the mixture starts to thicken, add the rest of the coconut milk, sugar and salt, then continue to stir the mixture together.
Keep stirring until the rice gets slightly more tender and absorbs all the coconut milk. The best way to check if the rice is ready is to taste it. It should still be a bit hard, not completely cooked. This whole process usually takes around 20 - 30 minutes.
Remove the coconut rice mixture from the stove. Allow it to cool for about 5 minutes.