|Born||January 27, 1980|
|Listed height||6 ft 5 in (1.96 m)|
|2012–2015||Seoul Samsung Thunders|
|2015–2016||Seoul SK Knights|
|Revised Romanization||I Dongjun|
Lee began his basketball career playing for the University of Portland in the 1998–1999 season, appearing in eight games and scoring an average of 106.5 points. He transferred to Seattle Pacific University in 2000. After his graduation, he went on to play on professional teams in Luxembourg and Germany before coming to South Korea in 2006.
In South Korea, Lee joined Yonsei University's team in March 2006. Lee's participation in university basketball was controversial because he was not a South Korean citizen and he had previously played in professional leagues in Europe. Even after he naturalised, Korea University continued to object to his participation due to his professional experience; after he was ruled ineligible, a physical altercation broke out at a September 2006 match between Yonsei University and Korea University. Coming to South Korea was a difficult adjustment for Lee in terms of culture and language. Philippine Olympic Committee president Monico Puentevella stated in media interviews that Sandrin had told him "he couldn’t relate with the Koreans because they hardly speak English … he felt more comfortable with our team. Nevertheless, Lee stated that he relished the opportunity to live in the country and learn more about his roots.
Lee would go on to play professionally in the Korean Basketball League for the Daegu Orions. He later moved to the Seoul Samsung Thunders. In January 2013 he and elder brother Lee Seung-jun were booked on assault charges in Mapo District, leading to controversy over whether they should be permitted to play in the then-ongoing KBL All-Star Games.
Lee was born into a basketball family: his father was an avid player, and taught the game to Lee's older brother and then to Lee himself. He graduated from Bothell High School in 1998 before going on to the University of Portland and then Seattle Pacific University. He naturalised as a South Korean citizen in June 2006, relinquishing his United States citizenship in the process. His elder brother Eric Sandrin followed him to South Korea and in 2009 also naturalised as a South Korean citizen, changing his name to Lee Seung-jun.
- "Korea's Next Hoops Star in Making". The Dong-A Ilbo. 2007-01-06. Retrieved 2013-05-09.
- "Daniel Sandrin Transfers from Portland, Joining Brother". Seattle Pacific University Athletics. 2000-05-23. Retrieved 2013-05-09.
- "The First Naturalized Half-Korean Brothers in KBL". Arirang News. 2010-03-26. Retrieved 2013-05-09.
- Henson, Joaquin (2007-08-06). "Summit to Tackle Basketball Issues". NewsFlash. Retrieved 2013-05-09.
- "이승준-이동준, 폭행 혐의 입건에도 올스타전 출전 논란 (Lee Seung-jun, Lee Dong-jun booking on assault charges causes All-Star Games controversy)". Korea Economic Daily. 2013-01-28. Retrieved 2013-05-09.
- "연세대 귀화 선수 이동준 '농구하고 싶어 美시민권 포기' (Yonsei University naturalised athlete Lee Dong-jun: 'I wanted to play basketball so I gave up U.S. citizenship')". Chosun Ilbo. 20 October 2006. Archived from the original on 17 December 2013. Retrieved 9 May 2013.
- Yoo, Jee-ho (2010-11-12). "Half-Korean player on S. Korean basketball team realising dream at Asiad". Yonhap. Retrieved 2013-05-09.