As a regional hub for education, Hong Kong has seen a growing population of international students. In contrast to existing conceptual models in acculturation literature that are typically devoted to studying long-term settlers such as migrants or refugees in English speaking countries, this study develops and tests a fine-grained model for degree-seeking mobile students in East Asia. A mixed-method study was conducted: a survey of 619 international students across six Hong Kong universities and focus group interviews with 22 Asian and nine non-Asian students. Bilingual competences were found to play significant roles in predicting sociocultural adaptation together with academic efficacy, social support, contact with locals, and psychological adaptation. This study offers practical and managerial insights for educational policymakers, university senior management and administrations, academicians, and research communities on how to manage the expansion and accommodate the needs of international students so that we can cater for a culturally diverse body of students. This research is significant because it extends the literature by examining sociocultural adjustment during crosscultural transitions in the increasingly globalised context of Hong Kong.