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I'd like to know whether that sentence is grammatically correct.
To my way of thinking, that doesn't sound quite correct. If I were the writer who wrote that sentence, I would say as "Collecting stamps is one of his hobbies"
But If we could think of "a hobby" as modifying the whole sentence "he collects stamps", I'd think that that sentence could be grammatically acceptable.
I'd like to know your opinions on my thinking.
Yes, "He collects stamps as a hobby" is grammatically correct. So is, "Collecting stamps is one of his hobbies." You could also say, "He has a hobby of collecting stamps," or, "He is a stamp collector."
In the sentence, "He collects stamps as a hobby," you can break it down like this:
