Coelho, who joined Teachers' TV six months ago, said the newly created Orbis role would give him the chance to work across a number of different areas.
‘As well as PR and media relations, I will be working on Orbis's online and marketing activity,' he said.
One priority will be to help draw up a strategy for Orbis's 21st anniversary next year. The charity wants to generate awareness of its work on treating preventable blindness in the developing world.
Orbis head of comms Megan Munsell said the new role had been created to beef up the organisation's comms function ahead of next year.
Before Teachers' TV, Coelho spent two years at the British Council as comms manager. He described the broad marcoms remit of the Orbis job as similar to his role at the council.
In 2004 he worked as a programme co-ordinator in the art and culture team on London's successful 2012 Olympic bid.
Orbis is best known for its Flying Eye Hospital - a converted airliner that is equipped with an operating theatre and acts as a mobile teaching hospital.
Teachers' TV confirmed it is now on the hunt for Coelho's replacement.