|Date of birth||4 January 1982|
|Place of birth||Bingen am Rhein, Germany|
|Height||1.92 m (6 ft 4 in)|
|1996–2000||BFV Hassia Bingen|
|2000–2001||1. FC Kaiserslautern|
|2001–2003||1. FC Kaiserslautern II||39||(2)|
|2003–2004||SpVgg Greuther Fürth||1||(0)|
|2004–2009||SV Wehen Wiesbaden||138||(6)|
|* Senior club appearances and goals counted for the domestic league only|
Born in Bingen am Rhein, Germany, he played in the youth teams of Blau-Weiß Münster-Sarmsheim (1989–1996) and BFV Hassia Bingen (1996–2000). He made his debut as senior playing with 1. FC Kaiserslautern II in the 2001–02 season. After two seasons with them in the Regionalliga Süd. In summer 2003 he moved to SpVgg Greuther Fürth however he played only one match in the 2003–04 2. Bundesliga. During the winter break of that season he moved to SV Wehen Wiesbaden. He will play there for 5 and a half seasons making 138 league appearances and scoring 6 goals. He will play with Wehen in the Regionalliga Süd until 2007 when they were promoted to the 2. Bundesliga and he will play with them 2 seasons in the second German level (56 appearances and 6 goals). In summer 2007 he moved to another 2. Bundesliga side, FSV Frankfurt and stay with them one season.
In summer 2010 he will move to Hungary by signing with Debreceni VSC. On 1 May 2012 Šimac won the Hungarian Cup with Debrecen by beating MTK Budapest on penalty shoot-out in the 2011-12 season. This was the fifth Hungarian Cup trophy for Debrecen.
On 12 May 2012 Šimac won the Hungarian League title with Debrecen after beating Pécs in the 28th round of the Hungarian League by 4-0 at the Oláh Gábor út Stadium which resulted the sixth Hungarian League title for the Hajdús.
Updated to games played as of 7 May 2013.
- Wehen Wiesbaden
- Regionalliga Süd: 2006–07
- Debreceni VSC
- Dajan Simac - NK Tekstilac-Ravnice‚ football-lifestyle.co.uk
- Dajan Šimac statistics at Fussballdaten.de
- Dajan Šimac at kleeblatt-chronik.de (in German)
- "Debrecen lift cup after shoot-out success". UEFA.com. 2 May 2012. Retrieved 2 May 2012.
- "Debrecen 4-0 Pécs". UEFA.com. 12 May 2012. Retrieved 13 May 2012.
- "Debrecen crowned champions of Hungary". UEFA.com. 12 May 2012. Retrieved 13 May 2012.
- Dajan Šimac at mackolik.com
- Jagodinu pojačali Tišma i Šimac at FK Jagodina official website, 20-2-2014 (in Serbian)
- Dajan Šimac at Soccerway
- Dajan Šimac profile at Croatian Football Federation official website