Whisk soy sauce, vinegar, oil and honey in large bowl until blended. Season to taste with salt and pepper.
Steam broccoli florets until crisp-tender, about 5 minutes. Cool.
Mix broccoli and half of sesame seeds into dressing. Let marinate at room temperature at least 30 minutes or up to 2 hours, tossing occasionally. Transfer broccoli to platter. Pour dressing over. Sprinkle with remaining sesame seeds.