Purpose: This study aims to investigate the impact of an collaborative online international learning (COIL) program on student behavioral satisfaction and community engagement, with a focus on diversity and sustainability. Explore how these changes affect students' perceptions of the impact of these activities and their motivation to use sustainable practices in their future careers. Design/methodology/approach: A combination of research methods combining qualitative and quantitative methods was adopted. Quantitative data were collected through satisfaction surveys that included Likert scale to measure various aspects of the COIL experience. Qualitative data were obtained from students' open statements and semi-structured interviews. Analysis uses statistical and literary techniques to identify key themes and patterns in the student's understanding. Findings: Results showed overall high student satisfaction with COIL's activities; this highlighted the positive impact of multicultural leadership and integrating sustainability into the business. Statistical analysis revealed a positive relationship between the relationship quality created by COIL and the perception of safety-related factors. In addition, students have the desire to apply the principles they have learned in their future work. Originality/value: This study contributes to the understanding of sustainability education within COIL by examining three critical dimensions: the promotion of sustainable practices in future professional environments, the development of sustainability competencies and the impact of sustainability topics on students' perceived relationship quality and safety within collaborative international projects. Through this lens, the author investigates how COIL-based activities shape students' commitment to sustainable practices, enhancing their intercultural competence and readiness for a globalized workforce.