Having represented his country internationally on several occasions, Smejkal is expected to play for Czechia at the upcoming 2023 IIHF World Hockey Championship. Last season, after playing for Pelicans in Finland's SM-Liiga, he helped Czechia to a bronze medal at the 2022 tournament in Latvia by way of tying for fifth in team scoring with five points (two goals, three assists) and skating in each of his country's 10 games. He also skated in each of Czechia's four contests at the 2022 Winter Olympics in Beijing and scored once.