Dundee have signed striker Curtis on a one-and-a-half year deal, subject to international clearance.
The 31-year-old, who was last on the books of Indian Super League side Bengaluru, has previously enjoyed spells in Scotland with Motherwell, Aberdeen and St Mirren.
Main has also played for Darlington, Middlesborough and Shrewsbury Town, having scored 69 goals in 425 professional appearances.
Speaking after the deal was confirmed, he said: "It is a great feeling to be back in Scottish Football and I am really looking forward to getting started with Dundee.
"The manager was a big influence in my decision, I’ve worked with him in the past, and he knows what he is going to get from me and I know what I am going to get from him.
"For me, that was a big appeal to get the opportunity to work with him again. I can’t wait to get back out on the pitch in Scotland and to play in front of the Dundee supporters."
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Dundee boss Tony Docherty added: “I am absolutely delighted to bring Curtis to the club. I’ve got a good relationship with Curtis from my time as Assistant Manager at Aberdeen and I built up a strong bond with him.
"He has done fantastic work in the Scottish Premiership, he knows the league really well and he brings real quality in the type of striker that I feel the whole team will benefit from.
"Curtis is also a fantastic professional, I know what he will bring to the club and to the changing room, he has a really strong attitude along with a winning mentality.
"I must say a massive thanks to Tim and John for getting this deal over the line, as Curtis is a player that I have wanted to bring in right from when I got the job here.
"I believe Curtis will fit in extremely well with the way we play and I think he is a player that the fans will love.”
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