Dan Gaspar pursued his passion for goalkeeping as a club and national team goalkeeping coach in Portugal. Since 1993, Gaspar has worked with Carlos Queiroz as a goalkeeping coach, technical adviser, and assistant coach for several club and national team coaching assignments. These included the Portuguese men's national team in 1994, and from 2009 to 2010, the Portuguese U16 and U18 men's and women's youth teams from 1992 to 1993, and the South African men's national football team in 2001, as well as Sporting CP, J League Nagoya Grampus Eight, and the NY/NJ MetroStars.

In 2003 Gaspar worked with Luiz Felipe Scolari as the goalkeeping coach for the Portuguese men's national football team and also with José Antonio Camacho as the goalkeeping coach at S.L. Benfica, between 2003 and 2004.

On April 4, 2011, Gaspar became the assistant and goalkeeping coach for Iran's national team, alongside head coach Carlos Queiroz and assistant coach Omid Namazi.

On June 18, 2013, Iran qualified for the 2014 FIFA World Cup, before qualifying for the 2015 AFC Asian Cup months later.