Foreign Minister Ann Linde says the extra personnel will help with consular issues, which could be helping to return remains of the victims home, and assisting in contacts with Iranian authorities.
Seventeen of the 176 victims in the crash were Swedish citizens or lived in Sweden. Over the weekend, Iran admitted that the Ukrainian airline had been shot down by mistake by its armed forces.
On Sunday evening, Prime Minister Stefan Löfven spoke with Iran's president Hassan Rouhani. Löven's spokesperson described it as a "long and thorough" phone call, where Rouhani condemned the attack, and promised that authorities there would co-operate fully with the home countries of the victims.