No, you can't change a limited company to an LLP as they are entirely different entities. However, there are various other options you could take, such as transferring the company's assets to a new LLP, or inserting a new LLP as the owner of the company which could achieve a similar effect.
Clearly whether these would work would depend on why you are trying to achieve this.
If you'd like to discuss, please feel free to send me a DM.