The 33-year-old spin bowler, one of Wisden's five cricketers of the 20th Century, was sent home from the World Cup two weeks ago after being told about his positive drugs test.
He claimed he took a fluid-reducing tablet to improve his appearance without knowing it contained a banned substance.
"Although I find this penalty very harsh and I am extremely disappointed that this has happened I have decided that I no longer want to put my family under even more stress. Enough is enough," Warne said in a statement.
"I have decided to accept the decision of the committee on the chin and try to move on and deal with it the best way I can."
He said that he would now be looking at other work opportunities over the next 12 months, but is not retiring from cricket.
"I am definitely going to give it my best shot to get back to the top and will continue to train hard, work on my bowling and experiment with new deliveries," Warne said.
