No, you can't.

With E-visa, you have to enter Vietnam exactly arrival port which you applied for.

If you still need to change arrival port, we recommend you apply for Vietnam visa on arrival whose port of arrival can be switched among 5 international airports of Vietnam: Noi Bai – Hanoi, Cat Bi – Hai Phong, Da nang, Cam Ranh – Khanh Hoa and Tan Son Nhat – Saigon.