Vujačić made his senior national team debut for SFR Yugoslavia on 27 May 1989, in a friendly match against Belgium (0–1 loss in Brussels) – he played the entire second half. He was later included to UEFA Euro 1992, but the nation would be suspended due to the Yugoslav Wars. In total, he gained a total of 12 caps (eight plus four for the newly created FR Yugoslavia), but did not attend any major international tournament. His final international was a December 1996 friendly match away against Argentina.