No, completed surveys cannot be sent back to respondents for editing. However, as a survey owner you can edit their responses in the system. Also, if you want them to review and modify their responses before submission, you can enable the "Review/Print" feature and turn on the "Edit Response" toggle. This allows respondents to check and update their answers before finalizing their submission.
Helpfile of Review, Edit and Print Response: https://www.questionpro.com/help/review-print-edit-responses.html#overview
Please refer to the screenshot of Individual Edit response: https://app.screencast.com/87dLTdkxtcSdR