Model-based research has been enhancing the positive effectiveness of both Sport Education and Step-Game Approach on students’ technical, tactical and game-play improvements. Nevertheless, the analysis of students’ declarative understanding on the game in this area was scarce. This study examined their declarative understanding on the game during their participation in a hybrid Sport Education/Step-Game Approach teaching unit. Ninety-six students with no previous experience in either model participated in a 24-lesson volleyball season. A video-based test was developed to assess students’ declarative game understanding and applied before and after the teaching unit. Results showed that they improved in all tactical content taught during the unit. These results can find explanation on Sport Education features such as cooperative team practices and the possibility for being in roles other than players. Beyond that, instructional procedures considered by the Step-Game-Approach stimulated the development of students’ tactical awareness.