The vacancy arose after former India stumper Sameer Dighe quit just after one season as the Mumbai coach.
Mota succeeds Satish Samant as the under 19 coach.
The 46-year-old Samant, who played 101 first class games, had amassed 3,496 runs, with the highest score of 200 not out.
Samant, who represented Mumbai and Tripura, on his part said that it was a big responsibility.
"I'm very glad and very happy, but at the same time I know that it's a very big responsibility on me. I'm sure that I will fulfil with very positive results. So I'm hoping my presence will benefit players as well as the association. Let's hope for best," Samant said.
Under Samant, who was former Mumbai U23 coach, Mumbai had won the U23 championship.
Asked why Powar was not considered, Khanvilkar said, "They (Managing Committee) had said that there were some issues. There is a Managing Committee resolution that those who quit the job will not be considered again."
Powar had quit as the spin bowling coach of the MCA academy mid-way earlier this year.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)