Koukal started playing badminton in 1993, at a club owned by his father in Hořovice, and made his debut in the international tournament in 2000. In 2003 he was selected to join the national team, and at the same year, he won the mixed doubles title at the national championships partnered with Markéta Koudelková.
Koukal began playing badminton in 1993 at a club owned by his father in Hořovice and made his international debut in 2000. He joined the national team in 2003, winning the mixed doubles title with Markéta Koudelková that year at the national championships.