The 29-year-old had followed his father and brother Chris Eubank Jr into the ring, starting a professional boxing career with two wins.
Eubank senior paid tribute to his son, saying he was a “deep thinker who loved to challenge and accept wisdom”.
He said in a statement: “I never imagined that I would write these words or feel the feeling that I now have of the loss of my son. My family and I are devastated to learn of Sebastian’s death days before what would have been his 30th birthday.
“He leaves behind his wife Salma, his son Raheem born just a month ago, his mother Karron Meadows, his brothers Nathanael, Chris, Jr, Joseph, a sister Emily and countless relatives and friends.
“Sebastian grew up in Hove, England, but in recent years he has made his living in Dubai where he had a large circle of friends and was a leader in adopting healthy lifestyles and therapies. alternatives.
“Besides being a personal trainer and professional boxer, Sebastian was also a deep thinker who loved to challenge accepted wisdom. He was loved and respected by all who knew him and will forever be remembered by his friends and family.
“As a family, we now kindly ask for space and privacy to celebrate your life and remember the son, brother, husband, friend. “
Sebastian’s mother, Karron Meadows, added: “Our whole family mourns the tremendous loss of our son and brother, Sebastian. Please respect our grief and our privacy as we try to understand our loss. “
Adam Smith, Boxing Development Manager at Sky Sports, said: “Our hearts go out to the entire Eubank family we know so well at Sky.
“We are deeply shocked to hear this tragic news and think of them all at this terrible time. ”