The White Hart Lane outfit have agreed a fee believed to be in excess of £15million with Dinamo Zagreb for the 22-year-old Croatia international.
With three English teams in the semi-finals of this season's UEFA Champions League, Modric believes the quality of football in England speaks for itself.
"I'm happy to be joining such a big club," Modric said at a press conference in Zagreb.
"It will be a real pleasure to play in the English league which is the best in Europe, with three English clubs in the semi-finals of the Champions League."
Despite losing one of their brightest players, Dinamo sporting director Zoran Mamic was happy with the deal brokered with Spurs.
"Tottenham's president came to Zagreb," said Mamic. "We signed the agreement and everything is in order.
"We're very happy. Luka is leaving for an environment where he's going to progress, while Dinamo showed that we know how to do good deals."