Coetzee took over from Heyneke Meyer following a third-place finish for the Boks at the 2015 World Cup in England, but won just 11 of his 25 matches in charge.
His tenure included a first-ever home loss to Ireland, a maiden defeat at the hands of Italy, a humiliating record 57-0 away thumping in New Zealand and their worst home loss when they were beaten 57-15 by the All Blacks in 2016.
Coetzee's first year in charge was also the worst in Springbok history as they won only four of their 12 Tests.
But he believes South African Rugby put impediments in his path to success and that essentially he was doomed to fail from the moment he took over.
"I was the most successful Super Rugby coach at the time of my appointment and was requested to return to Springbok rugby from Japan because my country needed me," Coetzee wrote in a letter to SA Rugby that was leaked to the media last week.
"My treatment since my return suggested that elements in SARU (SA Rugby) embarked on a deliberate attempt to undermine me from the word go and to create the public impression of incompetence on my part whilst wilfully obstructing my efforts to be successful."
Coetzee was reportedly unhappy that he was not allowed to select his own backroom staff and that SA Rugby instituted a ban on the selection of overseas- based players who had not featured in more than 30 caps for the Springboks.
The new coach's first matches in charge will be a three-Test home series against England in June.
