Preheat your oven to 375°F (190°C).
Peel and chop the sweet potatoes into chunks. Boil them in a large pot of water until soft, about 15-20 minutes. Drain and mash until smooth.
In a mixing bowl, combine the mashed sweet potatoes, brown sugar, coconut milk, melted butter, egg, and vanilla extract. Mix until well incorporated.
Add the Jamaican jerk seasoning, ground cinnamon, nutmeg, and salt to the mixture. Stir until evenly combined.
Pour the sweet potato mixture into the pre-made pie crust, smoothing the top with a rubber spatula.
Place the pie on a baking sheet and bake in the preheated oven for about 30-35 minutes, or until the pie is set and slightly puffed.
While the pie is baking, prepare the rum glaze. In a small bowl, whisk together the dark rum and powdered sugar until smooth.
Once the pie is out of the oven and slightly cooled, drizzle the rum glaze over the top. Allow the glaze to set for about 10 minutes before slicing.
Serve warm or at room temperature.