This study aimed to assess the influence of students’ intrapersonal factors, namely Academic Intrinsic Motivation (AIM), Perceived Creativity Fostering Teacher Behavior (P-CFTB), Academic Self-Efficacy (ASE), and Self-Regulated Learning (SRL) on student engagement in undergraduate psychology students taking online Statistics courses. A cross-sectional and quantitative design was used from October to December 2022. The data collection procedure used a convenience sampling technique, with questionnaires distributed online (via social media) and offline (via lecturers, the Student Executive Board, and the Association of the Faculty of Psychology from various universities in Indonesia). The research participants were psychology undergraduates who had studied and passed the Statistics courses online, with 671 filling out the questionnaire. The results showed that all students’ intrapersonal factors, namely AIM, P-CFTB, ASE, and SRL, can determine student engagement by 66.9%, with ASE having the highest influence (23.99%) and P-CFTB having the lowest impact (9.78%). Moreover, the correlation value between SRL and SE was r = 0.700, p < 0.001, signifying a robust positive relationship between both variables. © 2023, Association for the Development of Science, Engineering and Education. All rights reserved.