Heat 1 tbsp (15 mL) oil in large skillet set over medium heat. Add onions and salt. Reduce heat to medium-low. Cook, stirring occasionally, 30 to 40 min., or until golden brown. Meanwhile, cook beans in boiling salted water 4 to 5 min., or until tender. Drain.
Toss green beans with caramelized onions and sundried tomatoes. Transfer to serving dish. Whisk remaining oil with balsamic vinegar. Drizzle over beans. Sprinkle with goat cheese and pine nuts. Serve warm or room temperature.
To toast pine nuts, bake on parchment paper-lined baking sheet in 350°F (180°C) oven, 5 to 6 min., or until lightly golden brown and fragrant.