Yoon, who is expected to attend the hearing, threw the nation into chaos on December 3 when he attempted to suspend civilian rule, citing the need to combat threats from “anti-state elements”.
Yoon was subsequently impeached by parliament and resisted arrest for weeks, holed up in his guarded residence until he was finally detained Wednesday in a dawn raid.
But the disgraced president remains in custody after investigators requested a new warrant Friday to extend his detention.
Yoon's lawyer Yoon Kab-keun told AFP the president would attend the hearing “with the intention of restoring his honour”.
The Corruption Investigation Office (CIO) is probing Yoon for insurrection, a charge that could see him jailed for life or executed if found guilty.
Yoon said Wednesday he had agreed to leave his compound to avoid “bloodshed”, but that he did not accept the legality of the investigation.
The court closed its entrance on Friday evening to the public, citing safety concerns.
The president has also been absent from a parallel probe at the Constitutional Court, which is mulling whether to uphold his impeachment.
He did not attend the first two hearings this week, but the trial, which could last months, will continue in his absence.
The Democratic Party has celebrated the president's arrest, with a top official calling it “the first step” to restoring constitutional and legal order.
As challenges against the embattled leader mount, parliament passed a bill late Friday to launch a special counsel probe into Yoon over his failed martial law bid.
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