A modified conjugated diene-based polymer comprising a repeating unit derived from a conjugated diene-based monomer, and a functional group derived from a modifier represented by the following Formula 1 in at least one terminal: in Formula 1, R 1 to R 6 are each independently an alkylene group of 1 to 20 carbon atoms, an alkenylene group of 2 to 20 carbon atoms, an alkynylene group of 2 to 20 carbon atoms, a cycloalkylene group of 5 to 30 carbon atoms, a cycloalkenylene group of 5 to 30 carbon atoms, a heteroalkylene group of 1 to 20 carbon atoms, an arylene group of 6 to 30 carbon atoms, or a heteroarylene group of 5 to 30 carbon atoms, R 7 to R 10 are each independently an alkyl group of 1 to 20 carbon atoms, an alkenyl group of 2 to 20 carbon atoms, an alkynyl group of 2 to 20 carbon atoms, a cycloalkyl group of 5 to 30 carbon atoms, a cycloalkenyl group of 5 to 30 carbon atoms, a heteroalkyl group of 1 to 20 carbon atoms, an aryl group of 6 to 30 carbon atoms, a heteroaryl group of 5 to 30 carbon atoms, or -R a1 -Si(OR a2) a (R a3) 3-a, where R a1 is an alkylene group of 1 to 10 carbon atoms, R a2 and R a3 are alkyl groups of 1 to 10 carbon atoms, and a is an integer selected from 0 to 3, R 11 to R 14 are each independently an alkyl group of 1 to 20 carbon atoms, or an aryl group of 6 to 20 carbon atoms, R m and R n are each independently an alkylene group of 1 to 3 carbon atoms, or an alkenylene group of 2 to 4 carbon atoms, m and n are integers selected from 1 to 3, and a hydrocarbon group or a hetero hydrocarbon group defined in R 1 to R 14, R m and R n is unsubstituted or substituted with a substituent, wherein the substituent is an alkyl group of 1 to 10 carbon atoms, an alkenyl group of 2 to 10 carbon atoms, an alkynyl group of 2 to 10 carbon atoms, a cycloalkyl group of 5 to 20 carbon atoms, a cycloalkenyl group of 5 to 20 carbon atoms, a heteroalkyl group of 1 to 10 carbon atoms, an aryl group of 6 to 20 carbon atoms, or a heteroaryl group of 5 to 20 carbon atoms. R 1 to R 6 are each independently an alkylene group of 1 to 20 carbon atoms, an alkenylene group of 2 to 20 carbon atoms, an alkynylene group of 2 to 20 carbon atoms, a cycloalkylene group of 5 to 30 carbon atoms, a cycloalkenylene group of 5 to 30 carbon atoms, a heteroalkylene group of 1 to 20 carbon atoms, an arylene group of 6 to 30 carbon atoms, or a heteroarylene group of 5 to 30 carbon atoms, R 7 to R 10 are each independently an alkyl group of 1 to 20 carbon atoms, an alkenyl group of 2 to 20 carbon atoms, an alkynyl group of 2 to 20 carbon atoms, a cycloalkyl group of 5 to 30 carbon atoms, a cycloalkenyl group of 5 to 30 carbon atoms, a heteroalkyl group of 1 to 20 carbon atoms, an aryl group of 6 to 30 carbon atoms, a heteroaryl group of 5 to 30 carbon atoms, or -R a1 -Si(OR a2) a (R a3) 3-a, where R a1 is an alkylene group of 1 to 10 carbon atoms, R a2 and R a3 are alkyl groups of 1 to 10 carbon atoms, and a is an integer selected from 0 to 3, R 11 to R 14 are each independently an alkyl group of 1 to 20 carbon atoms, or an aryl group of 6 to 20 carbon atoms, R m and R n are each independently an alkylene group of 1 to 3 carbon atoms, or an alkenylene group of 2 to 4 carbon atoms, m and n are integers selected from 1 to 3, and a hydrocarbon group or a hetero hydrocarbon group defined in R 1 to R 14, R m and R n is unsubstituted or substituted with a substituent, wherein the substituent is an alkyl group of 1 to 10 carbon atoms, an alkenyl group of 2 to 10 carbon atoms, an alkynyl group of 2 to 10 carbon atoms, a cycloalkyl group of 5 to 20 carbon atoms, a cycloalkenyl group of 5 to 20 carbon atoms, a heteroalkyl group of 1 to 10 carbon atoms, an aryl group of 6 to 20 carbon atoms, or a heteroaryl group of 5 to 20 carbon atoms.