Heat the oil in a heavy medium skillet over medium-high heat. Add the sausage and cook until brown and cooked through, breaking the sausage into bite-size pieces, about 5 to 8 minutes. Transfer the sausage to a plate. Cool to room temperature.
Chop and combine the lettuce, tomatoes, cheese, and cooked sausage in a large bowl. Add beans and enough vinaigrette to coat. Season the salad with salt and pepper, to taste, and serve.
Recipe courtesy of Giada De Laurentiis