This study contributes to the understanding of student teachers’ sustainable behaviors. (Future) teachers are perceived as models of social learning as they model desirable behavior, attitudes, values, and emotions while living and demonstrating a pro- sustainable lifestyle. Therefore, it is essential to understand which personal variables, aptitudes, and psychological benefits predispose them towards a pro-sustainable lifestyle. This study’s intent was to consider components that can affect sustainable actions such as psychological tendencies (e.g., attitudes, motives, beliefs, values, norms) and consequences (e.g., well-being or happiness) associated with sustainable actions. This study’s main objective was to test the sustainable behavior model on a sample of student teachers. A total of 496 student teachers participated in the study. The results analyzed by SEM indicate that student teachers’ sustainable behavior is directly predicted by their intention to act, which is both positively and significantly influenced by indignation and affinity towards diversity. Additionally, sustainable behaviors slightly (but statistically significantly) predict the self-assessment of happiness. These findings contribute to a better general understanding of sustainable behaviors’ antecedents and repercussion variables, especially within a student teacher population.