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 bell pepper.
In a separate bowl, mix together the BBQ sauce and ranch dressing until well combined.
Pour the dressing mixture over the pasta salad and toss gently to coat all ingredients evenly.
Season with salt and pepper to taste. If using, fold in the chopped cilantro.
Cover the salad and refrigerate for at least 30 minutes to allow the flavors to meld.
Serve chilled or at room temperature.