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Vasectomy can cause this pain depending on where the vas was divided. If divide at the testicle (common) then its very unlikely this explains his pain.
A vasectomy performed near the testicles and mid groin would be nearly impossible to unroof or cause an inguinal hernia.
Hernia can cause the same pain.
Hernia and a post vasectomy patient could cause this pain.Vasectomy can injury genital branch of GFN. If vasectomy is performed near the inguinal external ring it could affect the ilioinguinal and genital branch of GFN which can cause similar symptoms..
Inguinal hernias can cause compression of this nerve.He should get a thorough physical exam.
He should get dermatome map testing of the groin.
He could get a cord block under ultrasound guidance. If this takes care of his pain one could consider resection of the genital nerve and vasa vasorum of the vas deferens during an open inguinal hernia repair.He should see someone familiar with groin pain, mesh removal, etc before proceeding with a hernia repair. There is much that should be considered, discussed to develop appropriate expectations for everyone involved.