Cook the rotini pasta according to package instructions until al dente. Drain and rinse under cold water to cool.
In a large mixing bowl, combine the cooked pasta, shredded chicken, cherry tomatoes, corn, red onion, and cheddar cheese.
In a separate small bowl, whisk together the ranch dressing and BBQ sauce until well combined.
Pour the dressing mixture over the pasta salad and toss gently until everything is evenly coated.
Season with salt and pepper to taste. If desired, garnish with fresh cilantro or parsley.
Chill the pasta salad in the refrigerator for at least 30 minutes before serving to allow the flavors to meld.