Exploring and adapting learning development has been fascinating in recent decades. One is project-based online intercultural collaborative learning for international BIPA students in Thailand. Two simultaneous project-based learning classes are used in the quasi-experimental investigation. Indonesian students collaborate online in experimental classes. Knowledge exams and project product evaluations provided quantitative data, while communication recordings and semi-structured interviews provided qualitative data. The study found that BIPA novices improved from PBL adaptation. Online cooperation improves target culture theory and micro-setting life experiences, which aids early BIPA learning. Based on identified challenges, project-based online intercultural collaborative learning is advised to balance group work and individual aid for BIPA beginner learners, give team dynamics more time, and better use technology resources.