The investigators have conducted a "supplementary investigation of the allegations of abuse of power", writes the prosecutor.
He has previously been indicted for insurrection after proclaiming a state of emergency and martial law on December 3. He then claimed that the country had to be protected from an opposition that would "sell out" to arch-nemesis North Korea.
In early April, the president was removed when the Constitutional Court ruled in an impeachment trial that the state of emergency declaration did not meet the legal requirements for a national crisis.
Yoon will not be detained for the new charge, according to the prosecutor.
