Following a design-based research methodology, this investigation develops a pedagogical model to foster ocean citizenship through the application of a design cycle consisting of four phases: (1) preliminary research, (2) planning, (3) action and (4) evaluation. This article presents the results of phases 1 and 2, which define the conceptual foundation of the pedagogical model, and the planning of actions for its implementation in the school environment. The conceptual foundation was established by drawing upon the theoretical principles of a systemic/complex approach to education, along with theoretical-methodological elements compiled from the literature in the field of ocean literacy and ocean citizenship. During the planning phase, six educational activities were defined, to be conducted as part of a citizen science project to monitor the coastal zone. This model was developed with the objective of going beyond theoretical concepts, to offer schools a practical and objective guide for fostering ocean citizenship in basic education.