Northamptonshire's Silverstone will stage racing on 28 May, while Kent's Brands Hatch hosts action on 6 August.
The Spanish round at Valencia has been moved from 30 April to 23 April, while Monza has been brought forward by a week to 7 May.
The last of 13 races will be in South Africa on 22 October.
World Superbike Championship:
25 February - Qatar, Losail
5 March - Australia, Phillip Island
23 April - Spain, Valencia
7 May - Italy, Monza
28 May - Great Britain, Silverstone
25 June - San Marino, Misano
23 July - Czech Republic, Brno
6 August - Great Britain, Brands Hatch
3 September - Holland, Assen
10 September - Germany, Lausitz
1 Oct - Italy, Imola
8 October - France, Magny-Cours
22 October - South Africa, tba.
Silverstone and Brands Hatch will host rounds five and eight of the 2006 World Superbike Championship in May and August respectively.
