Professional development (PD) plays a crucial role in equipping teachers with the necessary knowledge and skills to effectively foster spatial ability among their students. This study aimed to explore the potential of action research as a PD mode for primary school teachers to enhance students’ spatial ability. The findings of this study indicate the positive impact of PD on teachers’ practice, leading to significant improvements in student performance and engagement. The PD program effectively equipped teachers with new knowledge and skills, leading to noticeable progress in their instructional approaches and teaching practices. This research provides a foundation for future studies on PD programs aimed at enhancing students’ spatial ability.