The third wave of the COVID-19 pandemic has made every higher education institution in Taiwan implement online learning. Given the circumstance, supporting students in their online self-regulated learning (SRL) became more critical to enabling students' learning maintenance and learning success. The present study explores the impact of instructor support and peers support on students' SRL during temporary online pivoted learning. 123 undergraduate and graduate students in Taiwan were surveyed on two scales The Instructor Support and Peers Support Questionnaire and The Self-Regulated Online Learning Questionnaire (SOL-Q). The descriptive results indicated that students had relatively good perceptions of instructor support, peers support and the online SRL. Additionally, the correlation analysis revealed that both instructor support and peers support had positive and moderate relationships with dimensions of the online SRL. Furthermore, the regression analysis substantiated the importance of instructor support to dimensions of metacognitive skills, persistence, and environmental structuring. In contrast, peer support was essential to metacognitive skills, persistence, and help-seeking. Lastly, there was a negligible impact of provided support on time management behaviors. The research suggested that educators and institutions should provide adequate support for students and facilitate interactive online learning environments for peer-to-peer support.