The company said the new organisation structure will be effective April 1, 2014.
Singh will be moving on to Toyota Motor Asia Pacific Engineering & Manufacturing (TMAP-EM), headquartered at Bangkok,
as executive managing coordinator.
"In his new role, he will head the Planning Group at TMAP-EM. His role in TMAP-EM is effective from April 1, 2014," TKM said in a statement.
Simultaneously, N Raja, senior vice-president and Akitoshi Takemura, senior managing coordinator, will jointly take charge of sales & marketing functions at TKM, it added.