In 2011, Tamim was signed by the county club Nottinghamshire, becoming the second Bangladeshi after Shakib Al Hasan to play for an English domestic club. In late October 2012, Wellington Firebirds signed him for the New Zealand domestic HRV Cup, a T20 competition. Tamim was the first Bangladeshi to play in a New Zealand domestic league.
In May that year, Bangladesh toured England for two more Tests and three ODIs. Though his team lost 2–0, Tamim scored a century in each of the Tests. For his performances against England, Tamim was named one of the Wisden Cricketers' Almanack's four Cricketers of the Year in 2011. In October he was also named Wisden's Test Player of the Year, ahead of Graeme Swann and Virender Sehwag, who came second and third respectively. During the qualifying period for the award, Tamim scored 837 runs in seven Tests at an average of 59.78. It was just the second time a Bangladesh player had won the award, as Shakib Al Hasan was named the previous year. At the start of November, the BCB announced 16 central contracts. Tamim was one of six players at the top level.
Tamim became only the second Bangladeshi to play county cricket in England (Shakib Al Hasan was the first) when he signed to play for Nottinghamshire in June 2011. He was recruited as a short-term replacement for Australian batsmen David Hussey, who was called up to the national squad. During his stay, Tamim played five matches, scoring 104 runs with a highest score of 47. Tamim, whose batting was described in the Nottingham Post as "solid if unspectacular", remarked of his performance that "It could have been better, but it wasn't too bad". Even though he was playing in a foreign country, there was pressure from the media in Bangladesh for Tamim to perform – especially when Nottinghamshire faced Worcestershire who were fielding Shakib Al Hasan – with his exploits sometimes making the front pages.
When Bangladesh toured Zimbabwe in July 2011 for a single Test and five ODIs, they did so with the expectation of winning. Zimbabwe were returning from a six-year exile from Tests, although Bangladesh had not played in the format in more than 14 months. Despite claiming in a press conference that Zimbabwe's bowlers posed little threat, Tamim managed 58 runs in the Test as Bangladesh slid to defeat. Bangladesh lost the following ODI series against Zimbabwe 3–2. Bangladesh's batsmen struggled early in the series, with Tamim managing 157 runs from five innings at an average of 31.40. In the aftermath of the series, Shakib and Tamim were sacked as captain and vice-captain, with a BCB representative citing their poor leadership.