Dr Dharmapragasam Inthiraraj, a former locum GP at the Woodbridge Medical Centre in Southall, "behaved in a predatory manner" towards two women in 2018, the Medical Practitioners Tribunal Service heard.
The misconduct panel found in the case of one patient, the 63-year-old performed an unnecessary exam of her genital area in September 2018 without consent.
When she tried to get up, he pushed her chest back telling her, "cool down, nothing has happened" and "enjoy it".
He denied the allegations, but tribunal chairwoman Julia Oakford ruled it took place.
The ordeal, which "in effect was a sexual assault", left the patient distressed and "very upset and disturbed", Ms Oakford found.
The panel also heard that the doctor contacted a vulnerable mother who was the victim of domestic abuse by obtaining her personal phone number from her medical records.
He then sent her messages with animal emojis, asking how she felt as he knew she was a domestic abuse victim and offering to talk to her any time.
The panel ruled the GP had a "pattern of inappropriate behaviour" towards the vulnerable woman in his attempt to form a sexual relationship with her.
The two women later complained to the GP practice about his behaviour.
In mitigation, counsel for Inthiraraj told the hearing that he acknowledged "unboundaried" behaviour with respect to the patient who had suffered domestic abuse, which he regretted, and said that he was previously of good character.
His lawyers said he denied the findings of fact towards the first patient, but that he accepted the seriousness of the accusation.
Ruling that he should be struck off from the medical register, Ms Oakford said: "Dr Inthiraraj, in behaving in the manner he did, showed a blatant disregard for patients and put his own interests above the need of his patients.
"The Tribunal viewed this as a serious abuse of the position of trust held by a doctor."
An immediate suspension order was also imposed to cover a 28-day appeals period before the strike-off order takes effect.
If you have been affected by any of the issues raised in this article, you can contact Dignity4Patients, whose helpline is open Monday to Thursday 10am to 4pm.