Cook pasta according to package directions; rinse in cold water and drain. Cool completely. Meanwhile, drain pineapple, reserving 2 tablespoons juice (discard remaining juice or save for another use); set pineapple aside.
In a small bowl, combine the yogurt, sour cream and reserved pineapple juice until smooth; cover and refrigerate.
In a large bowl, combine pasta, pineapple, cantaloupe and grapes. Just before serving, stir in strawberries. Drizzle with yogurt mixture; toss to coat.