N.J. Stat. § 2A:62A-6.2
Notwithstanding any provisions of law to the contrary, no person who provides goods, services, or other assistance as the sponsor of a sports team which is organized or performing pursuant to a nonprofit or similar charter, or which is a member team in a league organized by or affiliated with a county or municipal recreation department, shall be liable in any civil action for damages to a player or participant as a result of his acts of commission or omission arising out of and in the course of his rendering those goods or services or that assistance.
The provisions of this section shall apply not only to organized sports competitions, but shall also apply to practice and instruction in that sport.
Nothing in this section shall be deemed to grant immunity to any person causing damage by his willful, wanton, or grossly negligent act of commission or omission, nor to any person causing damage as the result of his negligent operation of a motor vehicle.
N.J.S. § 2A:62A-6.2