To make the caramel sauce, combine the coconut sugar and water in a small saucepan over medium heat. Stir occasionally and let it come to a simmer, this should take 5-10 minutes.
Then, once its come to a light boil, add the vanilla extract and salt. Let it simmer for about 2-3 minutes, stirring frequently so it doesn't burn on the bottom.
After it has thickened up a bit, take it off the heat and transfer it to a small bowl. Let it cool for about 5 minutes, and it will thicken up even more.
Pour the can of coconut milk into a jar with a tight fitting lid, then pour in the caramel sauce. Give it a good shake to combine, then store it in the fridge for up to 2 weeks.