Language and culture are inseparable since individuals express themselves out of their cultural background, thus highlighting the importance of the cultural cultivation. Research has shown the positive effects of embedding foreign cultures in the writing process. However, intercultural competence is still not adequately reflected in current English as a foreign language (EFL) education. In addition, students feel demotivated to write in conventional writing courses, thus signifying an urgent call for innovation. As writing instructions that incorporate intercultural competence are insufficiently implemented, the current study, therefore, aimed to examine how EFL learners' intercultural sensitivity could be enhanced via the use of a cross-border writing instruction. A total of 44 sophomore English-majors in two required English Composition classes were respectively paired up with their American peers from a public liberal arts college. Data included students' responses to "Intercultural Sensitivity Scale" and focus-group interviews. The findings revealed positive affordances from the cross-border writing instruction, that pre-class activities (reading relevant materials, answering comprehension questions online, reviewing instructional videos) and online interaction with foreign peers enhanced the students' intercultural sensitivity. The participants held positive perceptions about the intercultural experience with foreign partners and such learning experience enhanced observation of the similarities as well as differences of diverse cultures.