This study aims to explain the factors that influence students' motivation to join the English club as an extracurricular activity at MTs Darul Ulum Semarang, referencing the three psychological needs in Self-Determination Theory (SDT): autonomy, competence, and connectedness. Utilizing a qualitative case study, this research involved two participants with varying levels of motivation. Data was collected through observation and in-depth interviews. The findings revealed that highly motivated students experienced a sense of autonomy in selecting activities, felt an increase in competence through active participation, and developed strong connections with peers and teachers within the club. Conversely, students with low motivation often did not feel a sense of autonomy, perceived themselves as less competent, and experienced minimal connectedness, leading to their low engagement. This research underscores the significance of fostering a positive learning environment that addresses these three psychological needs, ultimately enhancing students' intrinsic motivation.