In the 2015–16 season, Bieshaar made his debut in senior basketball, when spending time on loan with Spanish
LEB Oro side
C.B. Prat Joventut and
EBA club Queso Milner-Arenys Basquet Barcelona. In the course of the 2016-17 campaign, he debuted for Joventut Badalona in Spain's elite league
Liga ACB, while seeing considerable minutes for C.B. Prat Joventut in LEB Oro play. In August 2017, he signed with LEB Oro side
CB Clavijo. After another stint at prat, Bieshaar joined Austrian first league side
Oberwart Gunners in July 2020. On February 14, 2022, he has signed with
Feyenoord of the
BNXT League. Terrence Bieshaar played a fortunate season, 2023-2024, with Landstede Zwolle (BNXT League) On August 2, 2024, Bieshaar signed with the
Kaohsiung Aquas of the
Taiwan Professional Basketball League (TPBL). On December 31,
Kaohsiung Aquas terminated the contract relationship with Bieshaar. In January 2025, Terrence signed with Den Bosch Heroes. With Den Bosch Heroes he directly won the Dutch Cup. In the BNXT competition, Terrence and his team, were ranked as the first Dutch team. Currently, Terrence and his team of Den Bosch Heroes are in the finals for the Dutch championship. == International career ==