Bring 1.5 cups of water to a rolling boil. Add in couscous and turn to low. Let simmer until all water is absorbed. Place in a tupperware and into the refrigerator to chill.
Once the couscous has chilled mix together couscous, black beans, sweet corn, cherry tomatoes, and red onion in a large bowl. Set aside.
Prep dressing by placing all ingredients int a high-speed food processor and mixing on high for about a minute, or until smooth.
Pour dressing over couscous mixture and mix.