Cook pasta in a large pot of lightly salted boiling water as package directs. Drain; return to pot.
Meanwhile heat a large nonstick skillet over medium-high heat. Add sausage and onion and, breaking up sausage with a wooden spoon, saute 6 minutes or until no longer pink. Add broth and beans; bring to a boil. Reduce heat; simmer 3 minutes to blend flavors.
Pour over pasta, add arugula and toss to mix and coat.