The comedian was to perform on July 3, but agreed to put his gig back a day to accommodate Mr Simon.
The singer, whose hits with Art Garfunkel provided a soundtrack to the 60s, was only available to play in Cork on the July 3 date.
Peter Aiken, of Aiken Promotions, said: “Tommy politely changed his date for Paul Simon and we would like to him for being so accommodating.”
Aiken Promotions is staging the Marquee series of concerts from June 18 to July 6 at Cork’s Showgrounds, which are near the Páirc Uí Chaoimh GAA stadium.
Modern stars like Shayne Ward and Jay Z, as well as giants like Neil Young, Eric Clapton and Lou Reed, are also slated to appear on the stage in the big bell-tent.
Paul Simon’s appearance will be the first time the prolific singer-songwriter has appeared in Cork and his first time in Ireland since a sell-out show at Dublin’s Point Theatre 18 months ago.
Alongside Art Garfunkel, he is remembered for songs like Bridge over Troubled Water, Mrs Robinson, the Boxer, Homeward Bound, and the 59th Street Bridge Song (Feelin’ Groovy).
* Tickets for Paul Simon’s Cork gig go on sale at 9am on Friday, April 4, priced e70 and e75 through Ticketmaster’s booths, via 0818-719-300 and at the www.aikenpromotions.com website.
* US band the Killers will perform a one-off gig at Dublin’s Marley Park on August 21. Tickets go on sale at 8am on April 4 via Ticketmaster.