In a heavy saucepan, combine coconut milk, sugar and salt. Place over medium-high heat and bring to a boil, stirring often to dissolve sugar and salt. Remove from heat and pour into a bowl.
Cover bowl and refrigerate until very cold, about 2 hours. Freeze in an ice cream maker according to the manufacturer’s directions. Serve at once or transfer to an airtight container and freeze for up to 3 weeks.
Notes
You can make the ice cream base in advance, cover, and chill for up to 1 day before you churn it into ice cream.