Preheat the oven to 350°. Spread the sesame seeds in a pie plate and bake for about 5 minutes, until lightly browned and fragrant.
Bring a large pot of generously salted water to a boil. Working in batches, add the edamame to the pot and cook until just tender, about 5 minutes; use a wire skimmer to transfer each batch to a large bowl. Pat the edamame dry.
In a small bowl, whisk the melted butter with the toasted sesame seeds, sesame oil, chili-garlic paste and sweet chili sauce. Pour the sauce over the edamame, season with the salt and toss well. Transfer to a platter and serve.