Davies, 20, was born in a refugee camp in Ghana and spent the first five years of his life there before his family were resettled in Canada.
An ambassador for the United Nations refugee charity UNHCR, Davies said the athletes “will change people’s lives”.
“Not everyone understands the journey you have been on,” he wrote.
“But I do, and that’s an important part of what made me who I am.
“I’ve read your stories and learnt about the journeys you have all been through. You are the most courageous sports team in the world right now.
“You are role models now with the power to inspire others. Make no mistake, what you are about to do in Tokyo will change people’s lives.
“There are going to be young people who will take up sport because of you. There will be refugees who through watching you succeed will believe they can too.”
The Tokyo 2020 Paralympic Games begin on Tuesday, 24 August and will feature more than 220 athletes competing across 19 sports.
The Refugee Paralympic Team consists of six athletes; Burundi-born taekwondo fighter Parfait Hakizimana, Syria-born canoeist Anas Al Khalifa and swimmer Ibrahim Al Hussein, club thrower Alia Issa, Iran-born discus thrower Shahrad Nasajpour and swimmer Abbas Karimi, born in Afghanistan.
Afghanistan’s two Paralympic athletes, Taekwondo competitor Zakia Khudadadi and track athlete Hossain Rasouli, have been stopped from competing at the Games because of unrest in the country.
The refugee team believes their presence can provide hope and solidarity for those being forced to flee Afghanistan, after the Taliban seized control of the country, says chef de mission and former Paralympic swimmer Ileana Rodriguez.
“We are here representing the people of the world who are refugees, so all of us have been working very hard to send a message of hope and make sure that this team shows that.
“I am sure these athletes are going to give all of what they have during these Games to really support all the refugees out there and make them feel hopeful and the same message goes to the people of Afghanistan.”