You can buy large cutting boards for islands at your local home improvement stores. It will need to be anchored down with screws and wood glue from the bottom (inside the island itself). I hope this answered your question DiAnne
Hi Dianne, are you looking to replace the entire top or just make a cutting board insert?
Here is one way: https://www.hometalk.com/1772362/kitchen-island-made-from-3-4-birch-plywood-and-1-oak-board-top