Sem Steijn

ADO Den Haag

Steijn joined the academy of amateur club SV KMD in Wateringen in 2009, before joining the academy of ADO Den Haag two years later.

Loans to VVV-Venlo and Al Wahda

On 27 July 2018, Steijn signed his first professional contract with ADO Den Haag, until 2020 with an option for another year, and was subsequently loaned out to VVV-Venlo. At VVV-Venlo, he would play for the under-19 team and join his father Maurice Steijn to train with the first team. He made his professional debut on 25 September 2018, coming on as a substitute for Danny Post during a 0–3 win against RKVV Westlandia in the KNVB Cup. His debut in the Eredivisie followed in a 4–1 Eredivisie defeat to Feyenoord on 6 December 2018, replacing Peniel Mlapa. In doing so, he became the youngest ever Eredivisie debutant from VVV. On 23 April 2019, he also became VVV-Venlo's youngest ever goalscorer in the Eredivisie, in his second appearance in the competition, equalising in a 2–2 draw away against Heerenveen. In the summer of 2019, Steijn joined his father to play for Al Wahda on loan. However, he was not eligible to play and his father was sacked after three league games.

Return to ADO Den Haag

On 16 December 2019, Steijn returned to ADO Den Haag to train with the first team. On 27 January 2020, he extended his contract at ADO Den Haag with two years, until mid-2022. He played for Jong ADO Den Haag in the Derde Divisie for the remainder of the season until the league was…

On 29 August 2025, Steijn was called up for the Netherlands national football team for the first time, by head coach Ronald Koeman for FIFA World Cup qualifiers against Poland and Lithuania. He made his debut in the game against Lithuania on 7 September 2025, replacing Tijjani Reijnders in a 2–3 win.

Club

As of match played 9 September 2026

International

As of match played 7 September 2025

Steijn is the son of Maurice Steijn, who is a Dutch former footballer and currently the manager of Sparta Rotterdam.