Preheat the oven to 450 degrees F.
Place the green beans in a baking sheet, and add sesame oil, salt, and pepper. Toss to coat evenly, then spread into a single layer.
Roast for 10 minutes. While roasting, whisk together coconut aminos, garlic, ground ginger, and red pepper flakes in a bowl.
Remove the green beans from the oven and pour the sauce over them. Stir to coat, then spread out into a single layer.
Roast for another 5 minutes until crisp tender.
Sprinkle with sesame seeds, and serve warm.
