Current research highlights the need for more studies focused on how high-quality assessment strategies can contribute to coach learning in coach education. The use of e-portfolios, as formative assessment tools, has shown to contribute to student-coaches’ learning in university-based programs, but studies on this topic are still scarce. The aim of this action research project is to investigate the potentialities and challenges of the e-portfolio as a formative learning-oriented assessment tool in an undergraduate sport coach course in Brazil. By sharing this, from the perspective of student-coaches and the assistant-professors of the course, we reflect on the evidence with the intention to both inform colleagues doing similar work and contribute to an emerging body of assessment in coach education literature.