Abstract Opinion shopping is an essential indication of audit collusion. Hence, it is crucial to explore the driving factors of audit uopinion shopping to better control and address this issue. Drawing upon signaling theory, this paper explores the relationship between international expansion and audit opinion shopping and the moderating roles of internal control quality and auditors’ quality. We find that the higher the level of international expansion of an enterprise, the greater the likelihood of audit opinion shopping. Furthermore, we also find that high internal control quality and high auditor quality can weaken the positive relationship between international expansion and audit opinion shopping. Besides, heterogeneity analysis shows that the impact of international expansion on audit opinion shopping is more pronounced in non‐SOEs and firms which stay in the growth and maturity stage. This paper contributes to the antecedent research of audit opinion shopping and exposes the possible “dark side” of international expansion. Finally, this study may provide practical implications to help the authorities better regulate internationalized enterprises as well as contribute to the healthy development of the auditing market.