Your question indicates you are going from a more than one entity (Partnership) to a one person entity (Sole Proprietor). This would indicate an answer of YES.
The Sole Proprietor may not even need an EIN.
But if this is one "entity" (such as a LLC), the answer is "no". A Multi-Member LLC changing to a Single Member LLC does NOT need a new EIN for the LLC. But for purposes of W-9s/1099s, the person probably would want to get an EIN in their personal name.
This is from IRS: Here is link for you to research:
You will be required to obtain a new EIN if any of the following statements are true.
- You incorporate.
- Your partnership is taken over by one of the partners and is operated as a sole proprietorship.
- You end an old partnership and begin a new one.