BACKGROUND: Measuring range of motion (ROM) accurately using a universal goniometer or visual estimation is challenging for physical therapy students. Self-controlled (SC) feedback, where learners decide whether to receive feedback, can enhance learning and foster self-efficacy (SE) by promoting self-regulation. However, the impact of SC feedback on skill acquisition in ROM measurement technique and SE in physical therapy students remains unclear. This study investigates the effects of SC feedback on skill acquisition in ROM measurement techniques and students' SE. METHODS: Thirty physical therapy students were quasi-randomly assigned to an SC group, which chose feedback during practice, or a Yoked (Yk) group, which received feedback based on the SC group's schedule. A goniometric measurement task, in which participants measure the ROM of left knee flexion using a universal goniometer, and a visual estimation task, in which they estimate it visually, were set as the learning tasks. After a pretest, they completed the practice (3 trials × 4 blocks) followed by short-term retention test (STRT) and LTRT (LTRT). All tests consisted of 3 trials. Measurement accuracy and time were used as test performance for both tasks. SE of ROM measurements was measured before the start of each test using a 10-point Likert scale. Feedback related to measurement errors were provided during practice in line with each group's conditions. RESULTS: The SC group maintained high feedback frequency (80.0 ± 30.3%) during the practice. Both groups improved measurement accuracy and reduced time for goniometric measurement and visual estimation tasks, but no significant group differences were found. Goniometric accuracy exceeded visual estimation in both groups. SE before the pretest did not correlate with pretest accuracy. However, SE before the STRT correlated with accuracy at that time in both groups. In the SC group, SE before the LTRT test was related to the accuracy at the STRT. CONCLUSION: SC feedback did not demonstrate superior effectiveness, but external feedback improved ROM measurement accuracy and reduced measurement time. Moreover, SE after the practice was temporarily associated with accuracy, suggesting a potential link between SE and performance in skill acquisition.