The public broadcaster had also served him with a written warning, said spokesperson Kaizer Kganyago.
“Amankwaa has indicated that his account was used by someone without his authorisation. However, he takes full responsibility for this, as the account used belongs to him,” said Kganyago.
“The SABC has also instructed Mr Amankwaa to apologise to the public in this regard.”
Amankwaa had since “unreservedly withdrawn all the statements regarding homosexuality that caused an uproar on his Twitter account”, Kganyago added.
“The SABC, as a public broadcaster, does not support hate speech and any other statements that are perceived to be offensive, divisive [or] incite violence and create uncertainties in society.”
In a statement, Amankwaa said: “I would like to apologise to the SABC, an esteemed institution that embraces diversity, and to the South African public at large for the harm caused by what was written on my Twitter account.”
His tweets read last week: “Is gay a naturally born condition or a choice? The mere fact that you cannot respond rationally on the issues of gayism shows that it’s a problem and abnormality.”
Aids activist Zackie Achmat tweeted: “The most ignorant tweet for a while … @coudjoeamankwaa: Can a gay guy be cured to straight either medically or spiritually? #IAmQueer.”
Democratic Alliance MP Gavin Davis challenged the SABC to take action against Amankwaa.
“Our TV screens can’t be infested by homophobes as @coudjoeamankwaa.”
In another tweet, Olwethu Sipuka said: “The@SABCNewsOnline must deal with him. #KhujoMustFall.”
Read more: Coudjoe Amankwaa’s tweets spark rage