Campbell, who won 73 caps for England and also played for Arsenal and Tottenham, retired in May 2012 and is completing qualifications to start coaching.
There are, however, only four black managers employed by England's 92 professional clubs.
"I want to start abroad," Campbell says in an interview with the Guardian. "There are no opportunities for me here, not until attitudes change anyway.
He adds, "I've spoken to other black players who want to coach and they feel the same, that attitudes here are archaic. I hope and pray the environment changes."