I don't know that they do training courses, but you might want to have a look at the webite of
BH Wildlife Consultancy, who specialise in deer drone surveys.
They recently gave a presentation at the Forestry Commission day on managing deer. The presentation was both fascinating and informative, and I would think changed the perception of many in terms of what can be achieved through the use of drones.
As much as the flying of the drones themselves, they also had some interesting slides on how they conduct the surveys and utilise the data that is captured.