The England international made it a double following his award for March.
Owen edged ahead of Habib Beye to take the award.
Bob Moncur: "I think Owen has led by example in the last month or so and just simply got on with the job like a man.
"His goals have been crucial but as captain you need more than that, you need leadership and the understanding of everybody around you.
"You can see he has instilled that by the huddle before the games.
"Maybe in a few years people can look at that and say it was the start of something quite special under Kevin Keegan."