The IMF denied the allegation.
The deadliest Ebola outbreak ever has so far killed more than 7,300 people, mostly in the three states.
“A major reason why the Ebola outbreak spread so rapidly was the weakness of healthcare systems in the region, and it would be unfortunate if underlying causes were overlooked,” said Cambridge University sociologist and lead study author Alexander Kentikelenis.
Policies requiring that government spending be slashed were “extremely strict, absorbing funds that could be directed to meeting pressing health challenges”, the study said.
Mr Kentikelenis told the BBC’s Newsday programme that caps on wage bills meant countries could not hire heath staff and pay them adequately.
The IMF’s emphasis on decentralised healthcare systems had also made it difficult to mobilise a co-ordinated response to health emergencies such as the Ebola outbreak, he said.
Study co-author Lawrence King said Guinea, Liberia and Sierra Leone had met the IMF’s directives in 2013, just before the Ebola outbreak.
However, they all “failed to raise their social spending despite pressing health needs”, he said.
The IMF said in a statement that health spending in Guinea, Liberia and Sierra Leone had, in fact, increased in the 2010-2013 period. (read more)