Sport Fish Restoration and Recreational Boating Safety Act of 2019 This bill reauthorizes through FY2024 the Sport Fish Restoration and Boating Trust Fund which provides funding for several things, including fisheries conservation and management, water and boating infrastructure, and recreational boating safety. The bill also requires the Government Accountability Office to report on (1) the increasing use of nonmotorized vessels and their impacts on motorized and nonmotorized vessel access, (2) user conflicts at waterway access points, (3) the use of Sport Fish Restoration Program funds to improve nonmotorized vessel access and the reasons for providing such access, and (4) the use of Recreational Boating Safety Program funds for nonmotorized boating safety programs.