Mr Saca, 50, has not publicly commented on the accusations. He held office from 2004 to 2009.
He is one of three former presidents - who were in power in the last 16 years - currently under investigation by the country`s prosecutors.
Mauricio Funes, who succeeded Mr Saca and left office in 2014, is facing a civil action in connection with funds discovered in his bank accounts, allegedly obtained illegally.
He is also facing a related investigation into possible political corruption during his time in office.
Mr Funes denies the accusations.
In January, Francisco Flores died from a stroke as he waited his trial on charges of embezzlement and illegal enrichment.
He was in power from 1999 to 2004.
In its announcement, the prosecutor`s office said that Mr Saca was accused of fraud and money laundering.
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