Sanchez began working for ILM in 2001. Under the tutelage of creature supervisor , he helped lead the creature simulation team on Star Wars: Episode II Attack of the Clones (2002, George Lucas), setting up the costume for an all-digital Yoda. He was also filmed as a Temple Jedi but he was not seen in the final shot. However, he did double for Christopher Lee as Count Dooku for several establishing shots in the film. Due to his work, he can be seen in documentary From Puppets to Pixels: Digital Characters in Star Wars Episode II (2002). He returned to the Star Wars saga for Star Wars: Episode III Revenge of the Sith (2005, George Lucas) as digital clothing supervisor.
He was also responsible for supervising the clothing on the digital replacement of Yoda in Star Wars: Episode I The Phantom Menace (1999, George Lucas), work that was completed in 2003 between Episodes II and III, but only come to light with the release of the Blu-Ray editions in 2011.
He also reprised his role as Christopher Lee's double as Count Dooku for one brief shot of Star Wars: Episode III Revenge of the Sith (2005, George Lucas) in which Dooku's hands are sliced off by Anakin (who was played in that shot by John Knoll).
In print, he has contributed to Dressing a Galaxy: The Costumes of Star Wars. His personal diaries were featured in Star Wars Insider, and he contributed to the book Special Effects: The History and Technique by Richard Rickitt and Ray Harryhausen.