This was reported on the LMA's Twitter account.
The Spaniard won this award for the second time in his career.
The first was in the 2017/18 season.
Also nominated for the award were Marcelo Bielsa (Leeds), Daniel Farke (Norwich), Emma Hayes (Chelsea Women's Team), David Moyes (West Ham) and Brendan Rogers (Leicester).
Manchester City, under Guardiola, have become the Champion of England this season and have also won the FA Cup.
Earlier it was reported that Guardiola caught up with Mourinho in titles in the Premier League.