Hello PuKCAO.... you should read what I wrote in the other post... you might like it.. =)
YES MD can learn OMT... the head of OMM at NYCOM taught MDs from europe OMT. It is a 300hr course throughout 1 to 2 years.
Some DOs pay money to take classes for "on going education" in OMT. Where you have to take it at... i have no clue.. maybe someone in here might now.