The next day, drain the cashews of water, and place the nuts in a blender with the coconut milk, maple syrup, vanilla, and sea salt. Blend until completely smooth.
Transfer to a bowl, cover, and let chill in the fridge for 1-2 hours. Freeze in the ice cream maker according to the manufacturer's instructions.
Transfer one third of the frozen mixture to a freezer-safe container, and top with cookie crumbles. Add another third of the ice cream, and top with more cookies. Add the final third of the ice cream, and smooth the top. Sprinkle with any remaining cookie crumbles. Freeze for at least 4-6 hours before eating.