Preheat oven to 425 degrees F. Lightly oil a baking sheet or coat with nonstick spray.
In a large pot of boiling salted water, cook pasta according to package instructions; drain well.
Place asparagus in a single layer onto the prepared baking sheet. Drizzle with olive oil, salt and pepper, to taste; gently toss to combine. Place into oven and roast for 8-12 minutes, or until tender but crisp. Let cool before cutting into 1-inch pieces.
In a large bowl, combine pasta, asparagus, pesto, sun dried tomatoes and mozzarella.