HEAT oil in large nonstick skillet on medium heat. Add scallops; cook and stir 2 to 3 min. or until no longer translucent.
MEANWHILE, bring 4 qt. water to boil in large saucepan. Add pasta. Reduce heat to medium-low; cook 2 min., stirring frequently. Stir in vegetables; continue cooking 3 min.
DRAIN pasta; place in medium bowl. Add scallops and pesto sauce; mix lightly.