Heat a large skillet over medium-high heat. Add oil and tilt pan to coat. Stir in garlic; cook 30 seconds. Add green beans and saute, about 2 minutes.
Pour in soy sauce along with 1/4 cup water. Sprinkle with sesame seeds. Reduce heat to medium and cover pan. Cook for 8 to 10 minutes, shaking pan occasionally. Uncover, and stir beans to coat. Serve warm. Makes 6 servings.