Barca must find a new coach after Tito Vilanova stepped down last Friday.
"I'm keeping myself busy with hobbies and sport. I have my animals and a huge garden," Heynckes said.
"I think it would be impossible for me, after working at Bayern Munich, now to take over a new club.
"I have understood the signals my body has been giving me and I am feeling good, enjoying the time I have for myself."