Sansom, 54, is England's second most capped full-back having played 86 times for his country, but says alcohol problems have resulted in him sleeping on a park bench.
"I've been living homeless for 10 days," he told the Sun.
"That's because I've got no money, I'm a drunk, I'm feeling not very well and I'm a gambler. I've been living on the street. It's not good living on the bench."
Sansom briefly stayed with his elder sister but is living rough and has been drinking seven bottles of rosé wine a day.
He is divorced from wife Elaine and has sold most of his England caps due to his his descent into alcoholism.
A League Cup winner with Arsenal who played for England at the 1982 and 1986 World Cups as well as the 1988 European Championship, Sansom had just £20 in cash when he spoke to the Sun, along with an Oyster travel card and a pay-as-you-go phone.