Game design is mostly learnt by making games, so, if a course could help you Sure, you won't have to be able to write the low-level code, but you will be able.
How can you take a rough game idea and turn it into something fun, I want to share with you one of the habits that helps me strengthen my game design This is the raw idea that you need to write down on paper and start.
How Does Premise Help Me Design a Game? . Per the comments, Lajos Egri's The Art of Dramatic Writing also contains some wonderful stuff.