Dear Friend,
To be successful in life one requires Attitude and Aptitude and of course lots of Passion.
As your desire is to become a soft skill trainer, you have to gain all the abilities to become one through various courses and books some of our friends have suggested.
But in soft skill training an important aspect is understanding the other person, for which I don't think any course can be of much help.
I would suggest you to take a job as per your qualification and then probably take training programs in soft skills and side by side understand the human element in your surroundings (Work place, home, social gatherings).
These things would test your attitude and learning through programs and books would build the aptitude. About passion, since all these would tend to drain you, if your passion is not high enough you would automatically leave it before even reaching mid way.
Any qualification is not a good or bad, how we apply it make it.
I have seen lot of engineers move into this space, yours truly is one of them.
Take care,
Rajiv
TASMAC Consulting