1. Spoon half of ice cream into prepared pie plate. Sprinkle 1/2 cup toffee bits over ice cream. Spoon in remaining ice cream. Cover; freeze until firm, 4 to 6 hours.
2. Prepare sauce by combining sugar, evaporated milk, butter, corn syrup and salt in medium saucepan. Cook over low heat, stirring constantly, until mixture boils; boil and stir 1 minute. Remove from heat; stir in remaining 1 cup toffee bits. Cool, stirring occasionally.
3. Serve wedges of pie with sauce. Cover; store leftover pie in freezer. Cover; store leftover sauce in refrigerator. .