In December 2018, Tomiyasu was re-called to the Japanese squad for the 2019 AFC Asian Cup. He made his tournament debut for the national side, starting the whole game and helped Japan win 3–2 against Turkmenistan. Tomiyasu helped Japan kept a clean sheet by beating Oman 1–0 win to advance to the knockout stage. He then scored his first goal for the national side, scoring from a header, in a 1–0 win against Saudi Arabia to reach the semi–finals. Tomiyasu later played two more matches of the tournament, which saw the national side reaching the final for the first time since 2011. n the AFC Asian Cup final against Qatar, he started and captained the side, as they lost 3–1, finishing as runner–up in the process.