Purpose : To identify motivational determinants explaining Physical Education teachers’ behaviors promoting students’ physical activity (PA) amidst the COVID-19 pandemic. Method : Nine hundred thirty-one Italian and French teachers completed a questionnaire assessing motivational determinants (self-determined motivation, self-efficacy, perceived ease and usefulness toward digital technologies, engagement at work), their intention and behaviors promoting PA, in reference to before and during the pandemic. Path analyses tested the associations of changes in motivational determinants with changes in intention and behaviors. Results : Increases in autonomous, controlled motivation, self-efficacy, and perceived usefulness toward digital technologies, and a decrease in amotivation were associated with an increase in the intention to promote PA. In turn, an increase in intention, but also in self-efficacy, autonomous motivation, and perceived usefulness toward digital technologies were paired with an increase in behaviors promoting PA. Conclusion : Implications regarding the commitment of Physical Education teachers to challenging pedagogical situations, such as promoting PA amidst the COVID-19 pandemic, are discussed.