This paper deals with communication networks of four upper-intermediate level Japanese language learners with in-country experience who are studying at an Australian university, and it also examines the relationship between the learners’ networks and language learning. Utilizing Boissevain’s criteria for network analysis, this study compares the characteristics of the informants’ current networks with those that existed prior to their in-country experiences. In addition, this study applied the framework of communicative competence developed by Hymes and Neustupny to analyse the informants’ language learning that occurred within their networks.