Sporting CP B was founded in 2000 and competed in the
third division of the
Portuguese football league system until the end of the 2003–2004 season, when it was dissolved. It was during this period of the B team that
Cristiano Ronaldo made his domestic senior football competition debut, in a 2–1 defeat at the
S.C. Lusitânia ground on 1 September 2002. His senior football debut happened on 14 August 2002, in the first team, against
Inter Milan on the second leg of the third qualifying round of the
UEFA Champions League. In May 2012, the
Liga Portuguesa de Futebol Profissional announced several changes to the
second division of the Portuguese football league system, including an increase in the number of participating teams through the incorporation of five B teams from
Primeira Liga clubs, including Sporting CP B. This change increased the number of matches to 42 per season and was implemented in the
2012–2013 season. In their first season after returning, Sporting B finished in fourth place (all-time best position), under the management of coaches
Oceano Cruz and
José Dominguez. At the start of the 2013/2014 season, Sporting B represented the club in the
Taça de Honra, played at the
Estádio António Coimbra da Mota, due to the first team being in the
United States playing pre-season matches. After defeating
SL Benfica B in the semi-final, it beat the reserve team of
G.D. Estoril Praia on penalties, winning the first trophy in the team's history. In the
2017/2018 season, the team finished in 18th place, which resulted in relegation. This performance, together with the announcement of the establishment of a national under-23 championship, a new tier, to begin in the 2018/2019 season, in which
Sporting CP will participate, culminated in the decision by president
Bruno de Carvalho to terminate the B team. Fulfilling one of his election promises and taking advantage of a reorganization in the third division of the Portuguese football league system, president
Frederico Varandas announced, in 2019, the reactivation of the B, which returned to competition in the following season. In the
2020/2021 season, Sporting CP B entered directly into the
Campeonato de Portugal, which, due to being replaced in the following season by
Liga 3 as the third division of the Portuguese football league system, allowed 22 teams to qualify for the new competition. By finishing second in the first qualifying phase, behind
Estrela da Amadora, it failed to qualify directly, which forced it to compete in the second phase, where it finished in first place, qualifying for the new competition. In
2021/2022, it made its debut in the new national competition, Liga 3. It remained in this division until the
2024/2025 season, when, despite changing coaches three times, it managed to finish fourth in the southern zone, which allowed it to compete in the championship play-offs. The team finished in second place, behind
Lusitânia F.C., earning a direct promotion spot to
Liga Portugal 2. In
2025/2026, after eight seasons, Sporting CP returned to compete in Liga Portugal 2. ==Players==